# compress.py
import zstandard as zstd
from concurrent.futures import ThreadPoolExecutor
import logging

class CompressionModule:
    def __init__(self, compression_level=3, block_size=1024*1024):
        self.compression_level = compression_level
        self.block_size = block_size
        self.compressor = zstd.ZstdCompressor(level=compression_level)
        self.thread_pool = ThreadPoolExecutor(max_workers=4)
        self.logger = logging.getLogger('compression')

    def compress_block(self, data):
        """压缩单个数据块"""
        try:
            compressed = self.compressor.compress(data)
            ratio = (1 - len(compressed)/len(data)) * 100
            self.logger.info(f"Compression ratio: {ratio:.2f}%")
            return compressed
        except Exception as e:
            self.logger.error(f"Compression error: {e}")
            raise

    def compress_stream(self, input_stream):
        """并行压缩数据流"""
        blocks = []
        while True:
            block = input_stream.read(self.block_size)
            if not block:
                break
            blocks.append(block)
        
        futures = [self.thread_pool.submit(self.compress_block, block) 
                  for block in blocks]
        return [f.result() for f in futures]

# dedup.py
import hashlib
import lmdb
from typing import Dict, Set
import logging

class DeduplicationModule:
    def __init__(self, db_path, chunk_size=1024*1024):
        self.chunk_size = chunk_size
        self.env = lmdb.open(db_path, map_size=1024**3)
        self.logger = logging.getLogger('deduplication')
        self.stats = {'total_chunks': 0, 'dedup_chunks': 0}

    def calculate_hash(self, data: bytes) -> str:
        """计算数据块哈希值"""
        return hashlib.sha256(data).hexdigest()

    def process_chunk(self, chunk: bytes) -> tuple:
        """处理单个数据块"""
        chunk_hash = self.calculate_hash(chunk)
        self.stats['total_chunks'] += 1
        
        with self.env.begin(write=True) as txn:
            if txn.get(chunk_hash.encode()):
                self.stats['dedup_chunks'] += 1
                return chunk_hash, None
            else:
                txn.put(chunk_hash.encode(), chunk)
                return chunk_hash, chunk

    def get_dedup_ratio(self) -> float:
        """计算重删率"""
        if self.stats['total_chunks'] == 0:
            return 0.0
        ratio = (self.stats['dedup_chunks'] / self.stats['total_chunks']) * 100
        self.logger.info(f"Deduplication ratio: {ratio:.2f}%")
        return ratio

# encrypt.py
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
import os
import logging

class EncryptionModule:
    def __init__(self, key_size=256):
        self.key = os.urandom(key_size // 8)
        self.logger = logging.getLogger('encryption')

    def encrypt_block(self, data: bytes) -> tuple:
        """加密数据块"""
        iv = os.urandom(16)
        cipher = Cipher(
            algorithms.AES(self.key),
            modes.GCM(iv),
            backend=default_backend()
        )
        encryptor = cipher.encryptor()
        ciphertext = encryptor.update(data) + encryptor.finalize()
        self.logger.info("Using AES-256-GCM encryption")
        return (ciphertext, iv, encryptor.tag)

# pipeline.py
import logging
from typing import BinaryIO

class BackupPipeline:
    def __init__(self, compression, dedup, encryption):
        self.compression = compression
        self.dedup = dedup
        self.encryption = encryption
        self.logger = logging.getLogger('pipeline')

    def process_backup(self, input_stream: BinaryIO, output_stream: BinaryIO):
        """处理备份数据流"""
        try:
            # 压缩
            compressed_blocks = self.compression.compress_stream(input_stream)
            
            # 重删
            dedup_results = []
            for block in compressed_blocks:
                chunk_hash, chunk = self.dedup.process_chunk(block)
                if chunk:
                    # 加密
                    encrypted_data = self.encryption.encrypt_block(chunk)
                    dedup_results.append((chunk_hash, encrypted_data))
                else:
                    dedup_results.append((chunk_hash, None))
            
            # 写入结果
            for chunk_hash, data in dedup_results:
                if data:
                    output_stream.write(data[0])  # 写入加密数据
                    
            # 记录性能指标
            self.logger.info(f"Deduplication ratio: {self.dedup.get_dedup_ratio():.2f}%")
            
        except Exception as e:
            self.logger.error(f"Backup pipeline error: {e}")
            raise
